Non-Volatile Memory Usage - HP 350 G2 Maintenance And Service Manual

Non-volatile memory usage

Non Volatile
Memory Type
Real Time Clock
(RTC) battery
backed-up CMOS
configuration
memory (CMOS)
Controller (NIC)
EEPROM
Keyboard ROM
DIMM Serial
Presence Detect
(SPD)
configuration
data
System BIOS
Amount (Size) Does this
memory store
customer data?
256 Bytes No
64 KBytes (not No
customer
accessible)
64 KBytes (not No
customer
accessible)
256 Bytes per No
memory
module, 128
Bytes
programmable
(not customer
accessible)
4 to 5 MBytes Yes
Does this What is the
memory retain purpose of this
data when memory?
power is
removed?
Yes Stores system
date and time
and limited
keyboard
controller data.
Yes Store NIC
configuration
and NIC
firmware.
Yes Stores firmware
code (keyboard,
mouse, &
battery
management).
Yes Stores memory
module
information.
Yes Store system
BIOS code and
PC configuration
data.
How is data How is this
input into this memory write
memory? protected?
Using the F10 This memory is
Setup utility or not write-
changing the protected. HP
Microsoft recommends
Windows date password
and time. protecting the
F10 Setup
utility.
Using a utility A utility is
from the NIC required to write
vendor that can data to this
be run from DOS. memory and is
available from
NIC vendor.
Writing data to
this ROM in an
inappropriate
manner will
render the NIC
nonfunctional.
Programmed at A utility is
the factory. required for
Code is updated writing data to
when the system this memory and
BIOS is updated. is available on
the HP website.
Writing data to
this ROM in an
inappropriate
manner can
render the PC
nonfunctional.
Programmed by Data cannot be
the memory written to this
vendor. memory when
the module is
installed in a PC.
The specific
write protection
method varies
by memory
vendor.
System BIOS A utility is
code is required for
programmed at writing data to
the factory. this memory and
Code is updated is available on
when the system the HP website.
BIOS is updated. Writing data to
Configuration this ROM in an
data and inappropriate
settings are manner can
Non-volatile memory usage 101